Verify a web application works in a real browser with Playwright, covering navigation, form submission, interactions, console errors, screenshots, and responsive layout. Use when a UI feature needs end-to-end confirmation, a form flow must complete, or a change needs regression checking. Requires Node.js and installs Playwright if absent.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
Test the application in a real browser rather than claiming it works from a code read alone. A passing type-check or unit test does not mean the page renders, the form submits, or the network request succeeds. Run the app, drive it with Playwright, and report what actually happened.
## Step 1: Check for Playwright and a running app
```bash
# Check if Playwright is installed
npx playwright --version 2>/dev/null || echo "not installed"
# Check if there is an existing Playwright config
ls playwright.config.ts playwright.config.js 2>/dev/null
```
If Playwright is not installed, install it:
```bash
npm install --save-dev @playwright/test
npx playwright install chromium
```
Check whether the dev server is already running. If not, start it before writing tests. Use the project's start script - check `package.json` for the correct command (`npm run dev`, `npm start`, etc.). The server must be running for Playwright to connect.
## Step 2: Identify what to verify
Before writing any test, state the scenario in plain terms:
- What page or URL does the scenario start from?
- What actions does the user take? (navigate, click, type, submit, wait)
…
The line at the top of this page pins the label git:20260921.4ccfb75, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_g77zwuwsk3qdu53n
GET https://markdownregistry.com/api/v1/resolve?ref=khaledsaeed18/dotclaude/webapp-testing
GET https://markdownregistry.com/api/v1/blob/10e74d8fdbab8df00c2db3294bff47e188534533f8043ad3ea46a7607698dd2b
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